1. let x = a number
x^2+5
2. let x = a number
2x-(x+19)
3. let x = a number
2x=1/3x + 9
4. let x = 1st integer
x+1 = 2nd integer
x+2 = 3rd integer
(x+x+1+x+2)/4
=(3x+3)/4
5. let x=smallest integer
x+3 = largest integer
x+x+1+x+2+x+3 = 9(x+3)
= 4x+6= 9x+27
